It’s a troubling phenomenon that many of us think of as a modern psychological epidemic, a symptom of extreme emotional turmoil in young people, especially young women: cutting and self-harm. But few of us know that it was 150 years ago—with the introduction of institutional asylum psychiatry—that self-mutilation was first described as a category of behavior, which psychiatrists, and later psychologists and social workers, attempted to understand. With care and focus, Psyche on the Skin tells the secret but necessary history of self-harm from the 1860s to the present, showing just how deeply entrenched this practice is in human culture.